Final answer:
Each protofilament is assembled from tubulin, which is a protein that forms the structure of microtubules in the cytoskeleton of cells.
Step-by-step explanation:
Each protofilament is assembled from tubulin building blocks. Tubulin.
Tubulin is the protein that polymerizes to form structures called microtubules, which are components of the cytoskeleton of cells. These microtubules serve as tracks for the transport of organelles and are involved in cell division. Tubulin itself consists of two subunits, alpha-tubulin and beta-tubulin, which combine to form a dimer. These dimers then align themselves to form the long strands of a protofilament. A microtubule is typically made up of 13 protofilaments and is essential for maintaining cell structure and function. The process of assembling these building blocks is crucial for various cellular activities, including motility, intracellular transport, and maintenance of cell shape.
The building blocks of proteins are amino acids. Each protofilament in the context of microtubules is assembled from amino acid building blocks. These building blocks are synthesized in the ribosome, which is the site of protein synthesis.